Excitation of photosynthetic pigment by light is called as

Photochemical reactions

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Photooxidation reactions

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Anabolic reactions

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Exergonic reactions

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Solution

The correct option is A Photochemical reactions
Excitation of photosynthetic pigment by light is called photochemical reactions. Photosynthetic pigments such as chlorophyll a and b absorb light energy and get excited to higher energy levels which lead to the conversion of light energy into chemical energy. The electron gap is further filled by the photolysis of water. These reactions are called as photochemical reactions.
So, the correct answer is option A.

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